The issue of personal privacy protection in social networks has become people's current focus of attention. This paper studies the social network service providers' protection profile of users' personal privacy，their collection and storage of information，and sharing and opening of information. We found that the social network service has imperfect measures for user storage and privacy protection，the use and sharing of information is opaque，privacy protection need to be regulated. In the end，we attempt to make suggestions based on these problems.